Refactor test cases for improved readability and consistency

- Updated test functions in various test files to enhance code clarity by formatting long lines and improving indentation.
- Adjusted assertions to use multi-line formatting for better readability.
- Added new test cases for theme settings API to ensure proper functionality.
- Ensured consistent use of line breaks and spacing across test files for uniformity.

tests/unit/test_auth.py

@@ -0,0 +1,231 @@
+from services.security import get_password_hash, verify_password
+
+
+def test_password_hashing():
+    password = "testpassword"
+    hashed_password = get_password_hash(password)
+    assert verify_password(password, hashed_password)
+    assert not verify_password("wrongpassword", hashed_password)
+
+
+def test_register_user(api_client):
+    response = api_client.post(
+        "/users/register",
+        json={
+            "username": "testuser",
+            "email": "test@example.com",
+            "password": "testpassword",
+        },
+    )
+    assert response.status_code == 201
+    data = response.json()
+    assert data["username"] == "testuser"
+    assert data["email"] == "test@example.com"
+    assert "id" in data
+    assert "role_id" in data
+
+    response = api_client.post(
+        "/users/register",
+        json={
+            "username": "testuser",
+            "email": "another@example.com",
+            "password": "testpassword",
+        },
+    )
+    assert response.status_code == 400
+    assert response.json() == {"detail": "Username already registered"}
+
+    response = api_client.post(
+        "/users/register",
+        json={
+            "username": "anotheruser",
+            "email": "test@example.com",
+            "password": "testpassword",
+        },
+    )
+    assert response.status_code == 400
+    assert response.json() == {"detail": "Email already registered"}
+
+
+def test_login_user(api_client):
+    # Register a user first
+    api_client.post(
+        "/users/register",
+        json={
+            "username": "loginuser",
+            "email": "login@example.com",
+            "password": "loginpassword",
+        },
+    )
+
+    response = api_client.post(
+        "/users/login",
+        json={"username": "loginuser", "password": "loginpassword"},
+    )
+    assert response.status_code == 200
+    data = response.json()
+    assert "access_token" in data
+    assert data["token_type"] == "bearer"
+
+    response = api_client.post(
+        "/users/login",
+        json={"username": "loginuser", "password": "wrongpassword"},
+    )
+    assert response.status_code == 401
+    assert response.json() == {"detail": "Incorrect username or password"}
+
+    response = api_client.post(
+        "/users/login",
+        json={"username": "nonexistent", "password": "password"},
+    )
+    assert response.status_code == 401
+    assert response.json() == {"detail": "Incorrect username or password"}
+
+
+def test_read_users_me(api_client):
+    # Register a user first
+    api_client.post(
+        "/users/register",
+        json={
+            "username": "profileuser",
+            "email": "profile@example.com",
+            "password": "profilepassword",
+        },
+    )
+    # Login to get a token
+    login_response = api_client.post(
+        "/users/login",
+        json={"username": "profileuser", "password": "profilepassword"},
+    )
+    token = login_response.json()["access_token"]
+
+    response = api_client.get(
+        "/users/me", headers={"Authorization": f"Bearer {token}"}
+    )
+    assert response.status_code == 200
+    data = response.json()
+    assert data["username"] == "profileuser"
+    assert data["email"] == "profile@example.com"
+
+
+def test_update_users_me(api_client):
+    # Register a user first
+    api_client.post(
+        "/users/register",
+        json={
+            "username": "updateuser",
+            "email": "update@example.com",
+            "password": "updatepassword",
+        },
+    )
+    # Login to get a token
+    login_response = api_client.post(
+        "/users/login",
+        json={"username": "updateuser", "password": "updatepassword"},
+    )
+    token = login_response.json()["access_token"]
+
+    response = api_client.put(
+        "/users/me",
+        headers={"Authorization": f"Bearer {token}"},
+        json={
+            "username": "updateduser",
+            "email": "updated@example.com",
+            "password": "newpassword",
+        },
+    )
+    assert response.status_code == 200
+    data = response.json()
+    assert data["username"] == "updateduser"
+    assert data["email"] == "updated@example.com"
+
+    # Verify password change
+    response = api_client.post(
+        "/users/login",
+        json={"username": "updateduser", "password": "newpassword"},
+    )
+    assert response.status_code == 200
+    token = response.json()["access_token"]
+
+    # Test username already taken
+    api_client.post(
+        "/users/register",
+        json={
+            "username": "anotherupdateuser",
+            "email": "anotherupdate@example.com",
+            "password": "password",
+        },
+    )
+    response = api_client.put(
+        "/users/me",
+        headers={"Authorization": f"Bearer {token}"},
+        json={
+            "username": "anotherupdateuser",
+        },
+    )
+    assert response.status_code == 400
+    assert response.json() == {"detail": "Username already taken"}
+
+    # Test email already registered
+    api_client.post(
+        "/users/register",
+        json={
+            "username": "yetanotheruser",
+            "email": "yetanother@example.com",
+            "password": "password",
+        },
+    )
+    response = api_client.put(
+        "/users/me",
+        headers={"Authorization": f"Bearer {token}"},
+        json={
+            "email": "yetanother@example.com",
+        },
+    )
+    assert response.status_code == 400
+    assert response.json() == {"detail": "Email already registered"}
+
+
+def test_forgot_password(api_client):
+    response = api_client.post(
+        "/users/forgot-password", json={"email": "nonexistent@example.com"}
+    )
+    assert response.status_code == 200
+    assert response.json() == {
+        "message": "Password reset email sent (not really)"}
+
+
+def test_reset_password(api_client):
+    # Register a user first
+    api_client.post(
+        "/users/register",
+        json={
+            "username": "resetuser",
+            "email": "reset@example.com",
+            "password": "oldpassword",
+        },
+    )
+
+    response = api_client.post(
+        "/users/reset-password",
+        json={
+            "token": "resetuser",  # Use username as token for test
+            "new_password": "newpassword",
+        },
+    )
+    assert response.status_code == 200
+    assert response.json() == {
+        "message": "Password has been reset successfully"}
+
+    # Verify password change
+    response = api_client.post(
+        "/users/login",
+        json={"username": "resetuser", "password": "newpassword"},
+    )
+    assert response.status_code == 200
+
+    response = api_client.post(
+        "/users/login",
+        json={"username": "resetuser", "password": "oldpassword"},
+    )
+    assert response.status_code == 401